jQuery获取servlet返回的JSON

servlet如下：

package forum.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import forum.huhai.beanService.MenuService;
import forum.huhai.beanService.impl.MenuServiceImpl;

public class GetMenus extends HttpServlet {

	/**
	 * 
	 */
	private static final long serialVersionUID = 9142776995911654738L;

	@Override
	protected void service(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		class MenuForAjax{
			String id;
			String menuName;
			public MenuForAjax(String id,String menuName) 
			{
				this.id=id;
				this.menuName=menuName;
			}			
			
			public String toString()
			{
				return "{'id':'"+id+"','menuName':'"+menuName+"'}";
			}
		}
		class MenuList extends ArrayList<MenuForAjax>{
				/**
			 * 
			 */
			private static final long serialVersionUID = 8591018782693731102L;

				@Override
				public String toString()
				{
					String str="[";
					for(MenuForAjax m:this)
					{
						str+=m+",";
					}
					return str.substring(0,str.length()-1)+"]";
				}
			}
		MenuService menuService=new MenuServiceImpl();
		Map<String,String> menus= menuService.getMenus();
		MenuList menuList=new MenuList();
		for(String key:menus.keySet())
		{
			menuList.add(new MenuForAjax(key,menus.get(key)));			
		}		
		response.setContentType("application/x-json");
		PrintWriter out= response.getWriter();		
		out.print(menuList.toString());
		out.close();
	}
}

javascript如下：

$(document).ready(
			function()
			{
				//重置按钮清空FCKeditor中的内容
				$('#button_resetTopic').click(
					function()
					{
						var editor=FCKeditorAPI.GetInstance('content') ;						
						editor.SetData('');											
					}
				);
				//绑定版块选择框
				var getSections=function(mid)
				{
					$.post(
						'servlet/getSections',
						{'menuID':mid},
						function(data)
						{
							var sectionSelect=$('#select_selectSection');
							sectionSelect.clearAll();													
							var sections=eval(data);							
							$.each(sections,
								function(i)
								{																
									sectionSelect.addOption(sections[i].sectionName,sections[i].id);																
								}
							);	
						},
						'json'
					);
				};
				$.post(
					'servlet/getMenus',
					function(data)
					{
						var menuSelect=$('#select_selectMenu');
						var menus=eval(data);
						$.each(menus,
							function(i)
							{																
								menuSelect.addOption(menus[i].menuName,menus[i].id);								
							}
						);		
						var menuID=menuSelect.getSelectedValue();
						getSections(menuID);
						menuSelect.change(
							function()
							{							
								menuID=menuSelect.getSelectedValue();								
								getSections(menuID);
							}
						);									
					},
					'json'		
				);
			}
		);

注意：“response.setContentType("application/x-json");”，网上有的文章用的是“response.setContentType("text/xml;charset=utf-8");”，但我用“response.setContentType("text/xml;charset=utf-8");”时获得的是包含javascript的整个页面，而不是json数据，而用“response.setContentType("application/x-json");”获取到的就是JSON数据了。